Is PIO a Buy? What to Consider in 2026

Last updated July 2026

Short answer

The case for PIO is simple: low-cost, diversified exposure to NASDAQ OMX Global Water Index at a 0.75% expense ratio, anchored by names like PNR, ECL, VIE. If that is the exposure you want and you do not already own most of it through another fund, PIO is a strong core holding. The catch is concentration in its top names and overlap with broad-market funds you may already hold. Whether it is a buy comes down to whether you want NASDAQ OMX Global Water Index and at what cost. Not a recommendation; Walnut is not an investment adviser.

PIO vs SPY, 1 year

PIO:+1.86%SPY:+21.06%

Daily closes from Yahoo Finance, rebased to 100. Over the past year Invesco Global Water ETF (PIO) returned +1.86% versus SPY's +21.06%, underperforming by 19.20 percentage points over this window.

What are you buying with PIO?

PIO tracks the NASDAQ OMX Global Water Index, holding water utilities, infrastructure, and equipment companies from around the world. It charges 0.75% and yields under 1%, making it a growth-oriented theme fund. The key nuance versus Invesco's PHO is geography: PIO adds international names like Veolia and Geberit, while PHO stays US-only at a lower fee.

Largest holdings (approximate as of mid-2026; verify on Invesco's fund page):

Rank	Ticker	Company	% of PIO
1	PNR	Pentair plc	~8.6%
2	ECL	Ecolab Inc.	~7.9%
3	VIE	Veolia Environnement	~7.6%
4	ROP	Roper Technologies	~6.9%
5	GEBN	Geberit AG	~6.6%
6	SBS	Cia. de Saneamento Basico (SABESP)	~4.5%
7	6361	Ebara Corporation	~4.2%
8	FERG	Ferguson Enterprises	~4.0%
9	STN	Stantec Inc.	~3.8%
10	WAT	Waters Corporation	~3.6%

What's the case for PIO?

PIO is Invesco's global water ETF. It holds companies worldwide that create products to conserve and purify water, including Pentair, Ecolab, France's Veolia, Roper Technologies, and Switzerland's Geberit, and tracks the NASDAQ OMX Global Water Index. It charges 0.75% and yields under 1%, so it is a thematic growth fund. The obvious peer is Invesco's own US-only PHO, which is larger and cheaper; PIO's edge is adding international water names.

In its favour: it gives you NASDAQ OMX Global Water Index exposure in one ticker at a 0.75% expense ratio, which is simple to hold and cheap to own.

What should you weigh before buying PIO?

Cost vs alternatives: 0.75% is the fee; compare it to funds tracking a similar index.
Concentration: check how much of PIO sits in its largest holdings (PNR, ECL, VIE).
Overlap: if you already own a broad-market fund, you may already hold much of this.
Tracking scope: PIO only gives you NASDAQ OMX Global Water Index; it will not capture what sits outside that index.

How do you decide if PIO is a buy?

The useful question is rarely “will PIO go up?” It is “does this exposure fit my plan, at a cost I am happy with, without doubling up on what I already own?” Walnut connects your real brokerage so you can see exactly how PIO would overlap with your current holdings, analyze it by chatting through Claude or ChatGPT, and place any trade yourself. You stay in control.

The bottom line on PIO

The bottom line: PIO is a low-cost core building block for NASDAQ OMX Global Water Index exposure, not a tactical bet on a single name. If you want NASDAQ OMX Global Water Index exposure and the 0.75% fee is competitive for you, it does its job well. If you already own that exposure through another fund, adding it mostly doubles a fee without adding diversification. Decide from your goal and your existing holdings, not from where the market sat last week. Walnut is not an investment adviser.

Build a portfolio around PIO with Walnut

Use PIO as your core holding, then let Walnut's AI propose thematic satellites: AI infrastructure, dividend growth, clean energy, whatever you believe in. Connect your broker, build the basket in conversation, track it as one unit.

Create a free Walnut account

FAQ

Is PIO a good ETF to buy?

Walnut is informational, not investment advice. Whether PIO fits depends on your goals, time horizon, and what you already hold. It tracks NASDAQ OMX Global Water Index at a 0.75% expense ratio, so the questions that matter are whether you want that exposure, whether you already own it through another fund, and whether the cost is competitive for what it does.

What does PIO actually hold?

PIO tracks NASDAQ OMX Global Water Index. Its largest positions include PNR, ECL, VIE, ROP, GEBN and others (approximate, verify on Invesco's fund page). The holdings are what you are really buying, not the ticker.

What is PIO's expense ratio?

0.75% as of mid-2026. Over decades, the expense ratio is one of the few things you can control, so it is worth comparing against close alternatives that track a similar index.

Does PIO pay a dividend?

PIO distributes a dividend with an approximate yield of ~0.9% (mid-2026). See the PIO dividend page for how distributions work. Verify the current figure with Invesco.

What are the risks of buying PIO?

Like any index ETF, weigh concentration (how much sits in the top holdings), overlap with funds you already own, and whether NASDAQ OMX Global Water Index matches the exposure you actually want. PIO only gives you NASDAQ OMX Global Water Index, not what sits outside it.

How do I decide if PIO is right for me?

Start from your goal, then check four things: what PIO holds, its cost versus alternatives, how much it overlaps with what you already own, and whether the exposure fits your time horizon and risk tolerance. Walnut can analyze the overlap against your real holdings; you keep your broker and approve any trade.

Walnut is informational, not investment advice. Figures are approximations stamped to mid-2026; verify current data with Invesco or your broker. Nothing here is a recommendation to buy, sell, or hold any security.